Identify properties of triangles
I can use different properties to identify and sort triangles.
Identify properties of triangles
I can use different properties to identify and sort triangles.
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Lesson details
Key learning points
- Triangles always have three sides, vertices and angles.
- Triangles always have straight sides and sharp vertices.
- Triangles can have right angles.
- Vertices are the corners of a shape.
Keywords
Triangle - A polygon with three straight sides.
Vertex - The point where two lines meet.
Vertices - More than one vertex.
Properties - A character or quality that something has.
Common misconception
Pupils may see other shapes and collections of lines as triangles when they are not (e.g. shapes with rounded corners, three lines that do not all meet).
Provide pupils with shapes, and explore shapes in the environment, classifying them as 'triangles' and 'not triangles'. Ask children, 'Does this shape have three straight sides? Does it have clearly defined, sharp vertices?'
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Which of these images shows a right angle?
Q2.A right angle is the same as a turn.
Q3.How many right angles does this shape have?
Q4.Look at this triangle. Which of these statements are true?
Q5.Which letter does not have at least one right angle?
Q6.Which shapes have at least one right angle?
Assessment exit quiz
6 Questions
Q1.The corners of a shape are called the .
Q2.Which of these shapes are triangles?
Q3.Which of these statements are true for all triangles?
Q4.Which triangle is exactly the same size and shape as shape a)?
Q5.Which triangles have one right angle?
Q6.Which triangles have at least two sides the same length?